LAND USE CHANGE AND ITS SOCIO-ECONOMIC DRIVING FORCES UNDER STRESS OF PROJECT IN OLD RESERVOIR AREA —— Case Study of Linshui Reservoir Area of Dahonghe Reservoir in Sichuan Province   总被引：1，自引：0，他引：1  

SHAO Jing-an HUANG Xue-qin QU Ming WEI Chao-fu XIE De-ti 《中国地理科学(英文版)》2005,15(4):315-324

The old reservoir areas built in 1950s- 1970s left behind many socio-economic problems, because of the administrative backward migration and little migration fund, and all these problems would be tied to land. Based on interviewing with peasant households, combining land use survey and socio-economic statistical index, this paper analyzed land use change and its corresponding driving forces in Linshui reservoir area of Dahonghe Reservoir. Results showed that land use change in the reservoir area was mainly embodied on low-lying land submergence and migration requisition land. The former changed the land use patterns, and the latter mainly reconstructed original land property and made land over-fragmented. Cultivated land per capita was 0.041ha in this area, below the cordon of cultivated land per capita enacted by FAO. Currently, there were still 30.25% of peasant households being short of grain in trimester of one year, and there were 35.27% of people living under the poverty line. The conditions of eco-environmerit in Linshui Reservoir Area were worse, and healthy and sub-healthy eco-environment accounted for less proportion, composed of green belt around the reservoir area and paddy field ecosystem, and economic forest and orchard ecosystem, respectively. The stress of the reservoir project was macroscopic background to analyze the driving factors of land use change, and real underlying diving factor of the land use change in the area was the change of cultural landscape under the stress of reservoir project. The rapid increase of population was the key factor to induce the change of man-land relationship in the reservoir area, the low level of rural economy was the crucial factor to decide how migrants input for production, and the belief of migrants, influencing the land use patterns in a certain extent, was the inducing factor to keep land use stable. The low-lying submergence and infrastructure construction accompanied the reservoir project were leading factors driving land use change in the area, while changes in land use patterns, after the reservoir being built, were the responses of peasant households＇ behaviors to land use change.  相似文献   

绿洲生态环境质量评价指标体系研究--以张掖市绿洲为例   总被引：16，自引：1，他引：15  

刘振波  赵军  倪绍祥 《干旱区地理》2004,27(4):580-585

绿洲属于生态环境的极度脆弱区,同时绿洲生态系统又是一个复杂的系统,涉及自然与人文的诸多组元,因此定量评价其质量优劣状况具有重要意义也存在一定难度。在对我国西北内陆区域绿洲生态系统的性质和特点进行系统分析的基础上,根据整体性、实用性、稳定性、地域性、独立性原则,依据绿洲系统的压力-状态-响应模型,构建了适用于绿洲这一特殊景观类型的生态环境质量评价指标体系,并结合绿洲生态环境实际状况,应用层次分析法确定了各评价因子的权重和分级量化标准。在此基础上,以张掖市绿洲为例,对绿洲生态环境质量状况做了综合评价。  相似文献   

牙鲆饲喂湿颗粒饲料的应用研究   总被引：4，自引：2，他引：4  

陈四清  于东祥  马爱军  张少华  宋宗诚 《海洋科学》2002,26(7):59-61

采用0,10% ,20% ,40%和60 %比例的全价粉末饲料与冰鲜杂鱼混合 ,配制成湿颗粒饲料 ,投喂牙鲆(Paralichthysolivaceus,T.&S.) ,进行工厂化养殖试验。结果证明随着添加全价粉末饲料量的增加 ,饲料系数逐渐降低 ,鱼体增重率逐渐增加 ,在鱼体防病、成活率、体色方面 ,投喂添加粉末饲料的湿颗粒饲料都明显优于单一的冰鲜杂鱼 ,其中 ,4号饲料在养殖成本方面 ,每公斤鱼的饲料投入比鲜杂鱼节省1.26元  相似文献   

蓝非鲫肠道上皮组织的扫描电镜观察   总被引：3，自引：0，他引：3  

范瑞青  姜明  汝少国 《海洋科学》2001,25(11):53-55

消消化化道道黏黏膜膜上上皮皮组组织织是是吸吸收收和和同同化化营营养养物物质质的的 主主要要器器官官 , ,在在鱼鱼类类生生长长和和发发育育的的过过程程中中发发挥挥着着极极其其重重 要要的的作作用用 , ,研研究究鱼鱼类类消消化化系系统统有有利利于于深深入入探探讨讨其其食食性性 及及消消化化生生理理学学特特征征 , ,对对于于提提高高经经济济鱼鱼类类的的养养殖殖产产量量和和 营营养养附附加加值值 , ,促促进进养养殖殖环环境境开开发发具具有有重重要要意意义义。。近近年年 来来 , ,有有关关鱼鱼类类消消化化…  相似文献   

东海外陆架EA01孔末次冰期最盛期的三角洲沉积   总被引：7，自引：3，他引：7  

李绍全  李双林  陈正新  唐保根  陈裕迅 《海洋地质与第四纪地质》2002,22(3):19-26

对东海 EA 0 1孔 (30°2 2 .96 15′ N、 12 5°4 5 .6 0 5 5′ E)岩心的沉积层序、粒度成分、沉积物年代、底栖有孔虫组合及其沉积环境的研究 ,揭示了东海外陆架末次冰期最盛期的三角洲沉积。钻孔 0 .36～ 2 9.6 5 m为一不完整的进积三角洲沉积层序 ,自下而上依次为前三角洲、河口沙坝和分流间湾的交替沉积 ;末次冰期三角洲的发育 ,表明了冰期低海面时期外陆架上的继承性沉降盆地仍被海水覆盖 ;盆地的区域沉降与海平面的共同作用形成了容纳沉积物的有效空间 ,捕获了河流带来的沉积物而形成三角洲 ,这是河流对海平面变化和构造下沉的响应 ,同时也反映了冰期陆架环境的多样性  相似文献   

农业生态地质环境研究中生物─水文地球化学方法──以华北平原沧州金丝小枣主产区为例          下载免费PDF全文

李瑞敏  侯春堂  邵时雄 《地球科学》1995,(4)

土壤溶液既是养分,又是养分载体,在养分由岩土→水（土壤溶液）→植物体系统中起着中介的作用,本文以金丝小枣所需养分供、输、耗系统为主线,采用生物─水文地球化学方法,通过分析计算输入系数、配比系数、吸收系数等一系列生物─水文地球化学参数,探讨地质环境影响枣林品质的作用机制,即地质环境的农业生态效应机制。  相似文献   

中国城市生活垃圾处理能力的时空格局及影响因素     

吕承超  邵长花 《地理科学》2021,41(5):768-776

基于2003—2017年中国30个省份的数据,探究城市生活垃圾处理能力的时空格局,并构建动态面板数据模型实证检验中国城市生活垃圾处理能力的影响因素。研究结果表明,考察期内城市生活垃圾处理能力存在空间发展不平衡问题;进一步利用Dagum基尼系数测算城市生活垃圾处理能力的空间差距并将其进行分解,其中,东部地区的地区内差距最大,地区间差距则以东部地区和西部地区之间最大,而超变密度则是空间差距的主要来源;此外,通过回归模型发现人均GDP、专利授权数、城镇化水平以及无害化处理厂数目的提升将促进城市生活垃圾处理能力的提高。  相似文献   

A Coal Permeability Model with Variable Fracture Compressibility Considering Triaxial Strain Condition     

Tang  Jun  Zhu  Jie  Shao  Tangsha  Wang  Jinge  Jiang  Yaodong 《Natural Resources Research》2021,30(2):1577-1595

Natural Resources Research - Fracture compressibility and strain boundary conditions are key factors in the evolution of coal permeability. Previous research has shown that fracture compressibility...  相似文献   

赤水林区旱季雾水对地表径流的水量贡献   总被引：2，自引：0，他引：2       下载免费PDF全文

陈建生  赵洪波  詹泸成 《水科学进展》2016,27(3):377-384

为探明赤水林区旱季地表径流补给来源组成以及雾水对该地区的水量贡献,于2014年12月对区域内水量大、易进入的3条瀑布径流进行了采样,样品包括雾水、泉水和溪水。通过对水样进行D、18O同位素分析,并与遵义的降水同位素数据对比,发现赤水林区旱季雾水的D、18O明显比降水富集;泉水和溪水具有相似的氢氧同位素组成,都落在11月与12月的降水同位素之间,且都分布于遵义地区降水线附近。赤水林区旱季地表径流主要受地下水补给,地下水是前期间断性的降水与持续不断的雾水的混合。雾水间接补给地表径流,是旱季地表径流重要的水量来源。在四洞沟、十丈洞和燕子岩这几个区域的平均补给量达到了24.1%(D同位素的计算结果),18O同位素的计算结果为20.0%。  相似文献   

A Review of the Methods and Controls of Soil Weathering Rates     

Huang Laiming  Shao Ming&#x  an  Jia Xiaoxu  Zhang Ganlin 《地球科学进展》2016,31(10):1021-1031

The study of soil weathering processes College of Resources and Environment, rates and the associated influencing factors is crucial for understanding of the feedbacks between soil and environment, which will provide a basis for predicting soil behavior and evolution trend in the ecosystem under natural and anthropogenic forcings. This is also important for the effective management of soil resources. This article reviewed the methods for measuring soil weathering rates (including simulating leaching experiment, model calculation, isotope technique, element depletion and geochemical mass balance) and the influencing factors (including climate, organism, parent material, relief, time and human activities). In view of the serious degradation of soil resources, we proposed the challenge and opportunity of the research of soil weathering. The future study should focus on the critical processes, rates and the associated environmental thresholds of soil weathering under varying natural conditions and intensive human perturbations, including the establishment of the quantitative relationship between the weathering rates calculated by different methods, the analysis and interpretation of synergistic effects among multiple influencing factors, and the modeling and prediction of changing tendency of weathering rates under the impacts of both climatic changes and human activities, in order to guide the sustainable management of soil resource and mitigation of global change.  相似文献